Width of the J P= {1}/{2}+ pentaquark in the quark-diquark model
Abstract
We analyse the width of the θ({1}/{2}+) pentaquark assuming that it is a bound state of two extended spin-zero ud-diquarks and the s¯ antiquark (the Jaffe-Wilczek scenario). The width obtained when the size parameters of the pentaquark wave function are taken close to the parameters of the nucleon is found to be ≃150 MeV, i.e., it has a normal value for a P-wave hadron decay with the corresponding energy release. However, we found a strong dynamical suppression of the decay width if the pentaquark has an asymmetric "peanut" structure with the strange antiquark in the center and the two diquarks rotating around. In this case a decay width of ≃1 MeV is a natural possibility.
- Publication:
-
Physics Letters B
- Pub Date:
- August 2004
- DOI:
- 10.1016/j.physletb.2004.05.040
- arXiv:
- arXiv:hep-ph/0405037
- Bibcode:
- 2004PhLB..594..265M
- Keywords:
-
- High Energy Physics - Experiment;
- High Energy Physics - Phenomenology
- E-Print:
- 3 new references added, version accepted to Physics Letters B
